Electrical insulator.



N0. 698,097. Patnted Apr. 22, 1902.

H. P. BALL.

ELECTRICAL INSULATOR.

'Application med Aug. a1, 1961.) (No Modal.)

TORNEYv UNITED STATES PATENT OFFICE.

HENRY PRICE BALL, OF NEYV YORK, N. Y., ASSIGNOR TO GENERAL INCAN- DESCENT ARC LIGHT COMPANY, OF NEW YORK, A CORPORATION.

` ELECTRICAL INSU LAToR.

SPECIFICATION forming part of Letters Patent No. 698,09*?, dated April 22, 1902. Application filed August 31, 1901. Serial No. 73,929. (No model.)

To all whom, t may concern:

Be it known that I, HENRY PRICE BALL, a citizen of the United States, residing at New York city, county and State of New York, have invented certain new and useful Improvements in Electrical Insulators, of which the following is a speciication.

My invention relates to insulators of the type which may be employed for supporting electrical conductors carrying high-tension currents-'such for instance, as bus-bars, the terminals of oil-switches, rbc.

The invention consists, essentially, of an insulator having its body portion formed to present a large air-surface and provided with a iiange by means of which the insulator may be secured in position upon a switchboard or other supporting-body.

The invention consists, further, in various details of construction of the insulator and its support.

The object of the invention being to effectually insulate` the conductor from its support, which though it may be formedl of an insulating materialsuch as slate, marble, or concrete-will not be effective as an insulator for high-tension currents.

The accompanying drawings will serve to illustrate my invention, in which- Figure 1 is a side elevation and partial section showing an insulator mounted upon a switchboard and supporting bus-bars. 2 is a front view. Fig. 3 is a perspective view of the insulator. Fig. 4l is a top View of one of the bus-bars, its support, and a securingplate. f n y In the drawings, 10 indicates the body of the switchboard, or it may indicate a metal slab, concrete iloor, &c.; 11, support for the insulator held in position in any suitable manner upon the switchboard, floor, slab, tc. The particular construction of the support for the insulator is not material, so long as it serves its purpose to properly support the insulator upon the switchboard, oto. In the present case it consists of an annular recessed head 12, from the rear side of which project lugs 13. c

The insulator itself consists of a body 14, of porcelain or other suitable insulating inaterial. The bodyis cylindrical in section and Fig.A

preferably provided with a series of parallel grooves 15 in its surface. By reason of such parallel grooves an extended air-surface is provided, which serves to cut off the possibility of an electric discharge between the high-tension conductor carried by the insulator and the body of the switchboard, door, slab, 85o., and a flange portion 1G, greater in diameter than the body portion. The flange has formed in its periphery one or more transverse concave openings 17.

I do not limit myself to an insulator having a cylindrical body or a cylindrical body having parallel grooves in its surface, as other forms may be adopted. Both of these forms I have, however, found to be Well suited for the use for which they are designed.

In Fig. 1 the insulator is shown as having vits iiange located in the recessed head 12 of the support for the Ainsulator and secured therein and prevented from turning by means of the plate 18, annular washers 19, and screws 20, one of the latter located in the cavity 17 in the periphery of the insulator.

The body 14 of theinsulator is provided with an opening 21, which can be enlarged at the front and rear of the body, as shown, to form rectangular countersunk openings 22. Situated in the opening 21 is a rod 23, which may serve merely as a support or which may be used to conduct current from the conduce tor supported by it and the insulator. This rod is screw-threaded at both ends 24. Located over the ends of the rod` andwithin the rectangular countersunk openings 22 of the insulator are placed resilient washers 25, of liber or other material, which are secured in place upon the rod 23 by means of the nuts 26 27. The head of the nut 27 is. enlarged to form a flange 28.

Connected to the front' of the insulator through the support 29 are the bus-bars 30. The inner end of the support 29 is provided with a flange 31, which corresponds to the flange 28 on the nut 27 and is provided with a thread to receive the threaded end of the rod 23. j

32 33 are plates and bolts by means of which the bus-bars are secured upon the support 29.

Manifestly if other devices are to be supported by the insulatorsuch as the contacts sisting of a corrugated body portion and a supporting-flange, of means for securing said insulator upon a switchboard, floor, slab, or other similar body.

4c. The combination with an insulator, consisting,` of a corrugated body portion and a supporting-flange, a support for said insulator, a rod traversing,` said insulator, and a clamping device on the end of said rod.

In testimony whereof I affix Iny signature in the presence of two Witnesses.

HENRY PRICE BALL.

Vitnesses:

ALEXANDER PERRY, H. BALDWIN ACKLAND. 

